Utilization of novel materials,particularly high-T_(c)(critical temperature)superconductors,is essential to pursue the United Nations’Sustainable Goals,as well as to meet the increasing worldwide demand for clean and...Utilization of novel materials,particularly high-T_(c)(critical temperature)superconductors,is essential to pursue the United Nations’Sustainable Goals,as well as to meet the increasing worldwide demand for clean and carbon-free electric power technologies.Superconducting magnets are beneficial in several real-life applications including transportation,energy production,magnetic resonance imaging(MRI),and drug delivery systems.To achieve high performance,one must develop uniform,large-grain,infiltration-growth(IG)processed bulk YBa_(2)Cu_(3)O_(y)(Y-123)super-magnets.In this study,we report the magnetic and microstructural properties of a large-grain,top-seeded,IG-processed Y-123 pellet,which is 20 mm in diameter and 6 mm in height;the pellet is produced utilizing liquid Yb-123+Ba_(3)Cu_(5)O_(8) as the liquid source.All the samples cut from the top of the bulk exhibit a sharp superconducting transition(approximately 1 K wide)with the onset T_(c) of approximately 90 K.However,in the samples cut from the bottom surface,the onset T_(c) values slightly decreased to between 88 and 90 K,although still exhibiting a sharp superconducting transition.The top and bottom samples exhibited the highest remnant value of J_(c)(critical current density)at 77 K H//c-axis of 50 and 55 kA/cm^(2),respectively.The remnant J_(c) and irreversibility field values significantly fluctuated,being fairly low in some bottom samples.Scanning electron microscopy identified nanometer size Y-211(Y2BaCuO5)secondary-phase particles dispersed in the Y-123 matrix.Energy-dispersive spectroscopy clarified that the decreased both T_(c) and J_(c) for the bottom samples were attributed to liquid phase dispersion within the Y-123 phase.展开更多
BACKGROUND Mammary-type myofibroblastoma(MTMF)is a rare benign extramammary soft tissue tumor with myofibroblastic differentiation.Although 160 cases of MTMF have been reported in the literature since 2001,no cases of...BACKGROUND Mammary-type myofibroblastoma(MTMF)is a rare benign extramammary soft tissue tumor with myofibroblastic differentiation.Although 160 cases of MTMF have been reported in the literature since 2001,no cases of infarction or atypical mitosis have been reported so far.Herein,we report an unusual case of MTMF in the pelvic cavity,which mimicked some malignant features,including infarction,atypical mitosis,infiltrative growth,and prominent cytologic atypia,making it difficult to ascertain whether the tumor was benign.CASE SUMMARY A 49-year-old man complained of pain and discomfort in the right buttock for more than 4 mo and did not receive any treatment.Nuclear magnetic resonance imaging(MRI)showed a 13-cm-sized mass in his right pelvic cavity.Histologically significant differences were atypical mitosis figures and multiple necrotic foci in the tumor.In addition,smooth muscle and skeletal muscle were invaded within and at the edge of the tumor.These morphologic features are often reminiscent of malignant tumors and therefore pose a diagnostic challenge to pathologists.The tumor cells were strongly positive for both cluster of differentiation 34 and desmin,and the loss of retinoblastoma 1 shown by immunohistochemical and fluorescence in situ hybridization results confirmed the pathological diagnosis of MTMF.Currently,the patient is alive and in good condition without tumor recurrence or metastasis after 2.5 years of follow-up by telephone and MRI.CONCLUSION The two pseudo-malignant characteristics of infarction and atypical mitosis broaden the morphological lineage of MTMF,a rare mesenchymal tumor.展开更多
基金This work was presented at the International Conference on Carbon Materials and Nanotechnology,Osaka,Japan(JICCMAN 2020)which was held during June 30–July 1 of 2020 as an online summit.This work was delivered as an oral presentation and was acknowledged with the Outstanding Young Researcher Award.
文摘Utilization of novel materials,particularly high-T_(c)(critical temperature)superconductors,is essential to pursue the United Nations’Sustainable Goals,as well as to meet the increasing worldwide demand for clean and carbon-free electric power technologies.Superconducting magnets are beneficial in several real-life applications including transportation,energy production,magnetic resonance imaging(MRI),and drug delivery systems.To achieve high performance,one must develop uniform,large-grain,infiltration-growth(IG)processed bulk YBa_(2)Cu_(3)O_(y)(Y-123)super-magnets.In this study,we report the magnetic and microstructural properties of a large-grain,top-seeded,IG-processed Y-123 pellet,which is 20 mm in diameter and 6 mm in height;the pellet is produced utilizing liquid Yb-123+Ba_(3)Cu_(5)O_(8) as the liquid source.All the samples cut from the top of the bulk exhibit a sharp superconducting transition(approximately 1 K wide)with the onset T_(c) of approximately 90 K.However,in the samples cut from the bottom surface,the onset T_(c) values slightly decreased to between 88 and 90 K,although still exhibiting a sharp superconducting transition.The top and bottom samples exhibited the highest remnant value of J_(c)(critical current density)at 77 K H//c-axis of 50 and 55 kA/cm^(2),respectively.The remnant J_(c) and irreversibility field values significantly fluctuated,being fairly low in some bottom samples.Scanning electron microscopy identified nanometer size Y-211(Y2BaCuO5)secondary-phase particles dispersed in the Y-123 matrix.Energy-dispersive spectroscopy clarified that the decreased both T_(c) and J_(c) for the bottom samples were attributed to liquid phase dispersion within the Y-123 phase.
文摘BACKGROUND Mammary-type myofibroblastoma(MTMF)is a rare benign extramammary soft tissue tumor with myofibroblastic differentiation.Although 160 cases of MTMF have been reported in the literature since 2001,no cases of infarction or atypical mitosis have been reported so far.Herein,we report an unusual case of MTMF in the pelvic cavity,which mimicked some malignant features,including infarction,atypical mitosis,infiltrative growth,and prominent cytologic atypia,making it difficult to ascertain whether the tumor was benign.CASE SUMMARY A 49-year-old man complained of pain and discomfort in the right buttock for more than 4 mo and did not receive any treatment.Nuclear magnetic resonance imaging(MRI)showed a 13-cm-sized mass in his right pelvic cavity.Histologically significant differences were atypical mitosis figures and multiple necrotic foci in the tumor.In addition,smooth muscle and skeletal muscle were invaded within and at the edge of the tumor.These morphologic features are often reminiscent of malignant tumors and therefore pose a diagnostic challenge to pathologists.The tumor cells were strongly positive for both cluster of differentiation 34 and desmin,and the loss of retinoblastoma 1 shown by immunohistochemical and fluorescence in situ hybridization results confirmed the pathological diagnosis of MTMF.Currently,the patient is alive and in good condition without tumor recurrence or metastasis after 2.5 years of follow-up by telephone and MRI.CONCLUSION The two pseudo-malignant characteristics of infarction and atypical mitosis broaden the morphological lineage of MTMF,a rare mesenchymal tumor.
